Thanks your work to make life easier. Looks good to me.
--------------
jack_wang
>libsas fails to discover all sata devices in the domain. If a device fails
>negotiation and does not transmit a signature fis the link needs recovery.
>libata already understands how to manage slow to come up links, so treat these
>conditions as ata device attach events for the purposes of creating an
>ata_port. This allows libata to manage retrying link bring up.
>
>Cc: Jack Wang <jack_wang@xxxxxxxxx>
>Cc: Xiangliang Yu <yuxiangl@xxxxxxxxxxx>
>Cc: Luben Tuikov <ltuikov@xxxxxxxxx>
>Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
>---
> drivers/scsi/libsas/sas_ata.c | 71 +++++++++++++++++++-
> drivers/scsi/libsas/sas_discover.c | 1
> drivers/scsi/libsas/sas_expander.c | 125 ++++++++++++++++--------------------
> drivers/scsi/libsas/sas_internal.h | 6 +-
> include/scsi/sas.h | 4 +
> include/scsi/sas_ata.h | 8 ++
> 6 files changed, 136 insertions(+), 79 deletions(-)
>
>diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
>index 0ee6831..d14af22 100644
>--- a/drivers/scsi/libsas/sas_ata.c
>+++ b/drivers/scsi/libsas/sas_ata.c
>@@ -278,26 +278,84 @@ static struct sas_internal *dev_to_sas_internal(struct domain_device *dev)
> return to_sas_internal(dev->port->ha->core.shost->transportt);
> }
>
>+static void sas_get_ata_command_set(struct domain_device *dev);
>+
>+int sas_get_ata_info(struct domain_device *dev, struct ex_phy *phy)
>+{
>+ if (phy->attached_tproto & SAS_PROTOCOL_STP)
>+ dev->tproto = phy->attached_tproto;
>+ if (phy->attached_sata_dev)
>+ dev->tproto |= SATA_DEV;
>+
>+ if (phy->attached_dev_type == SATA_PENDING)
>+ dev->dev_type = SATA_PENDING;
>+ else {
>+ int res;
>+
>+ dev->dev_type = SATA_DEV;
>+ res = sas_get_report_phy_sata(dev->parent, phy->phy_id,
>+ &dev->sata_dev.rps_resp);
>+ if (res) {
>+ SAS_DPRINTK("report phy sata to %016llx:0x%x returned "
>+ "0x%x\n", SAS_ADDR(dev->parent->sas_addr),
>+ phy->phy_id, res);
>+ return res;
>+ }
>+ memcpy(dev->frame_rcvd, &dev->sata_dev.rps_resp.rps.fis,
>+ sizeof(struct dev_to_host_fis));
>+ /* TODO switch to ata_dev_classify() */
>+ sas_get_ata_command_set(dev);
>+ }
>+ return 0;
>+}
>+
>+static int sas_ata_clear_pending(struct domain_device *dev, struct ex_phy *phy)
>+{
>+ int res;
>+
>+ /* we weren't pending, so successfully end the reset sequence now */
>+ if (dev->dev_type != SATA_PENDING)
>+ return 1;
>+
>+ /* hmmm, if this succeeds do we need to repost the domain_device to the
>+ * lldd so it can pick up new parameters?
>+ */
>+ res = sas_get_ata_info(dev, phy);
>+ if (res)
>+ return 0; /* retry */
>+ else
>+ return 1;
>+}
>+
> static int smp_ata_check_ready(struct ata_link *link)
> {
> int res;
>- u8 addr[8];
> struct ata_port *ap = link->ap;
> struct domain_device *dev = ap->private_data;
> struct domain_device *ex_dev = dev->parent;
> struct sas_phy *phy = sas_get_local_phy(dev);
>+ struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy->number];
>
>- res = sas_get_phy_attached_sas_addr(ex_dev, phy->number, addr);
>+ res = sas_ex_phy_discover(ex_dev, phy->number);
> sas_put_local_phy(phy);
>+
> /* break the wait early if the expander is unreachable,
> * otherwise keep polling
> */
> if (res == -ECOMM)
> return res;
>- if (res != SMP_RESP_FUNC_ACC || SAS_ADDR(addr) == 0)
>+ if (res != SMP_RESP_FUNC_ACC)
> return 0;
>- else
>- return 1;
>+
>+ switch (ex_phy->attached_dev_type) {
>+ case SATA_PENDING:
>+ return 0;
>+ case SAS_END_DEV:
>+ if (ex_phy->attached_sata_dev)
>+ return sas_ata_clear_pending(dev, ex_phy);
>+ default:
>+ return -ENODEV;
>+ }
> }
>
> static int local_ata_check_ready(struct ata_link *link)
>@@ -562,6 +620,9 @@ static void sas_get_ata_command_set(struct domain_device *dev)
> struct dev_to_host_fis *fis =
> (struct dev_to_host_fis *) dev->frame_rcvd;
>
>+ if (dev->dev_type == SATA_PENDING)
>+ return;
>+
> if ((fis->sector_count == 1 && /* ATA */
> fis->lbal == 1 &&
> fis->lbam == 0 &&
>diff --git a/drivers/scsi/libsas/sas_discover.c b/drivers/scsi/libsas/sas_discover.c
>index c6681b4..dc8baef 100644
>--- a/drivers/scsi/libsas/sas_discover.c
>+++ b/drivers/scsi/libsas/sas_discover.c
>@@ -48,6 +48,7 @@ void sas_init_dev(struct domain_device *dev)
> case SATA_DEV:
> case SATA_PM:
> case SATA_PM_PORT:
>+ case SATA_PENDING:
> INIT_LIST_HEAD(&dev->sata_dev.children);
> break;
> default:
>diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
>index 68a80a0..18aef30 100644
>--- a/drivers/scsi/libsas/sas_expander.c
>+++ b/drivers/scsi/libsas/sas_expander.c
>@@ -166,17 +166,15 @@ static inline void *alloc_smp_resp(int size)
> return kzalloc(size, GFP_KERNEL);
> }
>
>-/* ---------- Expander configuration ---------- */
>-
>-static void sas_set_ex_phy(struct domain_device *dev, int phy_id,
>- void *disc_resp)
>+static void sas_set_ex_phy(struct domain_device *dev, int phy_id, void *rsp)
> {
>+ struct smp_resp *resp = rsp;
>+ struct discover_resp *dr = &resp->disc;
> struct expander_device *ex = &dev->ex_dev;
> struct ex_phy *phy = &ex->ex_phy[phy_id];
>- struct smp_resp *resp = disc_resp;
>- struct discover_resp *dr = &resp->disc;
> struct sas_rphy *rphy = dev->rphy;
>- int rediscover = (phy->phy != NULL);
>+ int rediscover = !!phy->phy;
>+ char *type;
>
> if (!rediscover) {
> phy->phy = sas_phy_alloc(&rphy->dev, phy_id);
>@@ -197,8 +195,14 @@ static void sas_set_ex_phy(struct domain_device *dev, int phy_id,
> break;
> }
>
>+ /* This is detecting a failure to transmit initial dev to host
>+ * FIS as described in section J.5 of sas-2 r16
>+ */
>+ if (dr->attached_dev_type == NO_DEVICE && dr->attached_sata_dev)
>+ phy->attached_dev_type = SATA_PENDING;
>+ else
>+ phy->attached_dev_type = dr->attached_dev_type;
> phy->phy_id = phy_id;
>- phy->attached_dev_type = dr->attached_dev_type;
> phy->linkrate = dr->linkrate;
> phy->attached_sata_host = dr->attached_sata_host;
> phy->attached_sata_dev = dr->attached_sata_dev;
>@@ -213,7 +217,7 @@ static void sas_set_ex_phy(struct domain_device *dev, int phy_id,
> phy->last_da_index = -1;
>
> phy->phy->identify.sas_address = SAS_ADDR(phy->attached_sas_addr);
>- phy->phy->identify.device_type = phy->attached_dev_type;
>+ phy->phy->identify.device_type = dr->attached_dev_type;
> phy->phy->identify.initiator_port_protocols = phy->attached_iproto;
> phy->phy->identify.target_port_protocols = phy->attached_tproto;
> phy->phy->identify.phy_identifier = phy_id;
>@@ -229,14 +233,33 @@ static void sas_set_ex_phy(struct domain_device *dev, int phy_id,
> return;
> }
>
>- SAS_DPRINTK("ex %016llx phy%02d:%c attached: %016llx\n",
>+ switch (phy->attached_dev_type) {
>+ case SATA_PENDING:
>+ type = "stp pending";
>+ break;
>+ case NO_DEVICE:
>+ type = "no device";
>+ break;
>+ case SAS_END_DEV:
>+ if (dr->attached_sata_dev)
>+ type = "stp";
>+ else
>+ type = "ssp";
>+ break;
>+ case EDGE_DEV:
>+ case FANOUT_DEV:
>+ type = "smp";
>+ break;
>+ default:
>+ type = "unknown";
>+ }
>+
>+ SAS_DPRINTK("ex %016llx phy%02d:%c attached: %016llx (%s)\n",
> SAS_ADDR(dev->sas_addr), phy->phy_id,
> phy->routing_attr == TABLE_ROUTING ? 'T' :
> phy->routing_attr == DIRECT_ROUTING ? 'D' :
> phy->routing_attr == SUBTRACTIVE_ROUTING ? 'S' : '?',
>- SAS_ADDR(phy->attached_sas_addr));
>-
>- return;
>+ SAS_ADDR(phy->attached_sas_addr), type);
> }
>
> /* check if we have an existing attached ata device on this expander phy */
>@@ -267,50 +290,25 @@ struct domain_device *sas_ex_to_ata(struct domain_device *ex_dev, int phy_id)
> static int sas_ex_phy_discover_helper(struct domain_device *dev, u8 *disc_req,
> u8 *disc_resp, int single)
> {
>- struct domain_device *ata_dev = sas_ex_to_ata(dev, single);
>- int i, res;
>+ struct discover_resp *dr;
>+ int res;
>
> disc_req[9] = single;
>- for (i = 1 ; i < 3; i++) {
>- struct discover_resp *dr;
>
>- res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
>- disc_resp, DISCOVER_RESP_SIZE);
>- if (res)
>- return res;
>- dr = &((struct smp_resp *)disc_resp)->disc;
>- if (memcmp(dev->sas_addr, dr->attached_sas_addr,
>- SAS_ADDR_SIZE) == 0) {
>- sas_printk("Found loopback topology, just ignore it!\n");
>- return 0;
>- }
>-
>- /* This is detecting a failure to transmit initial
>- * dev to host FIS as described in section J.5 of
>- * sas-2 r16
>- */
>- if (!(dr->attached_dev_type == 0 &&
>- dr->attached_sata_dev))
>- break;
>-
>- /* In order to generate the dev to host FIS, we send a
>- * link reset to the expander port. If a device was
>- * previously detected on this port we ask libata to
>- * manage the reset and link recovery.
>- */
>- if (ata_dev) {
>- sas_ata_schedule_reset(ata_dev);
>- break;
>- }
>- sas_smp_phy_control(dev, single, PHY_FUNC_LINK_RESET, NULL);
>- /* Wait for the reset to trigger the negotiation */
>- msleep(500);
>+ res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
>+ disc_resp, DISCOVER_RESP_SIZE);
>+ if (res)
>+ return res;
>+ dr = &((struct smp_resp *)disc_resp)->disc;
>+ if (memcmp(dev->sas_addr, dr->attached_sas_addr, SAS_ADDR_SIZE) == 0) {
>+ sas_printk("Found loopback topology, just ignore it!\n");
>+ return 0;
> }
> sas_set_ex_phy(dev, single, disc_resp);
> return 0;
> }
>
>-static int sas_ex_phy_discover(struct domain_device *dev, int single)
>+int sas_ex_phy_discover(struct domain_device *dev, int single)
> {
> struct expander_device *ex = &dev->ex_dev;
> int res = 0;
>@@ -615,9 +613,8 @@ int sas_smp_get_phy_events(struct sas_phy *phy)
> #define RPS_REQ_SIZE 16
> #define RPS_RESP_SIZE 60
>
>-static int sas_get_report_phy_sata(struct domain_device *dev,
>- int phy_id,
>- struct smp_resp *rps_resp)
>+int sas_get_report_phy_sata(struct domain_device *dev, int phy_id,
>+ struct smp_resp *rps_resp)
> {
> int res;
> u8 *rps_req = alloc_smp_req(RPS_REQ_SIZE);
>@@ -727,21 +724,9 @@ static struct domain_device *sas_ex_discover_end_dev(
>
> #ifdef CONFIG_SCSI_SAS_ATA
> if ((phy->attached_tproto & SAS_PROTOCOL_STP) || phy->attached_sata_dev) {
>- child->dev_type = SATA_DEV;
>- if (phy->attached_tproto & SAS_PROTOCOL_STP)
>- child->tproto = phy->attached_tproto;
>- if (phy->attached_sata_dev)
>- child->tproto |= SATA_DEV;
>- res = sas_get_report_phy_sata(parent, phy_id,
>- &child->sata_dev.rps_resp);
>- if (res) {
>- SAS_DPRINTK("report phy sata to %016llx:0x%x returned "
>- "0x%x\n", SAS_ADDR(parent->sas_addr),
>- phy_id, res);
>+ res = sas_get_ata_info(child, phy);
>+ if (res)
> goto out_free;
>- }
>- memcpy(child->frame_rcvd, &child->sata_dev.rps_resp.rps.fis,
>- sizeof(struct dev_to_host_fis));
>
> rphy = sas_end_device_alloc(phy->port);
> if (unlikely(!rphy))
>@@ -956,7 +941,8 @@ static int sas_ex_discover_dev(struct domain_device *dev, int phy_id)
>
> if (ex_phy->attached_dev_type != SAS_END_DEV &&
> ex_phy->attached_dev_type != FANOUT_DEV &&
>- ex_phy->attached_dev_type != EDGE_DEV) {
>+ ex_phy->attached_dev_type != EDGE_DEV &&
>+ ex_phy->attached_dev_type != SATA_PENDING) {
> SAS_DPRINTK("unknown device type(0x%x) attached to ex %016llx "
> "phy 0x%x\n", ex_phy->attached_dev_type,
> SAS_ADDR(dev->sas_addr),
>@@ -982,6 +968,7 @@ static int sas_ex_discover_dev(struct domain_device *dev, int phy_id)
>
> switch (ex_phy->attached_dev_type) {
> case SAS_END_DEV:
>+ case SATA_PENDING:
> child = sas_ex_discover_end_dev(dev, phy_id);
> break;
> case FANOUT_DEV:
>@@ -1658,8 +1645,8 @@ static int sas_get_phy_change_count(struct domain_device *dev,
> return res;
> }
>
>-int sas_get_phy_attached_sas_addr(struct domain_device *dev, int phy_id,
>- u8 *attached_sas_addr)
>+static int sas_get_phy_attached_sas_addr(struct domain_device *dev, int phy_id,
>+ u8 *attached_sas_addr)
> {
> int res;
> struct smp_resp *disc_resp;
>diff --git a/drivers/scsi/libsas/sas_internal.h b/drivers/scsi/libsas/sas_internal.h
>index 4157f6e..a37a5bd 100644
>--- a/drivers/scsi/libsas/sas_internal.h
>+++ b/drivers/scsi/libsas/sas_internal.h
>@@ -90,8 +90,9 @@ int sas_smp_get_phy_events(struct sas_phy *phy);
> void sas_device_set_phy(struct domain_device *dev, struct sas_port *port);
> struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy);
> struct domain_device *sas_ex_to_ata(struct domain_device *ex_dev, int phy_id);
>-int sas_get_phy_attached_sas_addr(struct domain_device *dev, int phy_id,
>- u8 *attached_sas_addr);
>+int sas_ex_phy_discover(struct domain_device *dev, int single);
>+int sas_get_report_phy_sata(struct domain_device *dev, int phy_id,
>+ struct smp_resp *rps_resp);
> int sas_try_ata_reset(struct asd_sas_phy *phy);
> void sas_hae_reset(struct work_struct *work);
>
>@@ -121,6 +122,7 @@ static inline void sas_fill_in_rphy(struct domain_device *dev,
> case SATA_DEV:
> /* FIXME: need sata device type */
> case SAS_END_DEV:
>+ case SATA_PENDING:
> rphy->identify.device_type = SAS_END_DEVICE;
> break;
> case EDGE_DEV:
>diff --git a/include/scsi/sas.h b/include/scsi/sas.h
>index 3673d68..a577a83 100644
>--- a/include/scsi/sas.h
>+++ b/include/scsi/sas.h
>@@ -89,8 +89,7 @@ enum sas_oob_mode {
> SAS_OOB_MODE
> };
>
>-/* See sas_discover.c if you plan on changing these.
>- */
>+/* See sas_discover.c if you plan on changing these */
> enum sas_dev_type {
> NO_DEVICE = 0, /* protocol */
> SAS_END_DEV = 1, /* protocol */
>@@ -100,6 +99,7 @@ enum sas_dev_type {
> SATA_DEV = 5,
> SATA_PM = 7,
> SATA_PM_PORT= 8,
>+ SATA_PENDING = 9,
> };
>
> enum sas_protocol {
>diff --git a/include/scsi/sas_ata.h b/include/scsi/sas_ata.h
>index cb724fd..0ca2f8a 100644
>--- a/include/scsi/sas_ata.h
>+++ b/include/scsi/sas_ata.h
>@@ -33,9 +33,10 @@
> static inline int dev_is_sata(struct domain_device *dev)
> {
> return dev->dev_type == SATA_DEV || dev->dev_type == SATA_PM ||
>- dev->dev_type == SATA_PM_PORT;
>+ dev->dev_type == SATA_PM_PORT || dev->dev_type == SATA_PENDING;
> }
>
>+int sas_get_ata_info(struct domain_device *dev, struct ex_phy *phy);
> int sas_ata_init_host_and_port(struct domain_device *found_dev,
> struct scsi_target *starget);
>
>@@ -82,6 +83,11 @@ static inline void sas_ata_schedule_reset(struct domain_device *dev)
> static inline void sas_ata_wait_eh(struct domain_device *dev)
> {
> }
>+
>+static inline int sas_get_ata_info(struct domain_device *dev, struct ex_phy *phy)
>+{
>+ return 0;
>+}
> #endif
>
> #endif /* _SAS_ATA_H_ */
>
>--
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>
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>
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